①x²-y²-6x+9②4x²+1/4-2x-9x²
问题描述:
①x²-y²-6x+9②4x²+1/4-2x-9x²
答
①x²-y²-6x+9=(x-3+y)(x-3-y)
②4x²+1/4-2x-9x²=(5x-1/2)(-x-1/2)